devel/rubygem-strscan: Update to 3.0.6

Changes:	https://github.com/ruby/strscan/releases
		https://github.com/ruby/strscan/blob/master/NEWS.md

devel/rubygem-strscan/Makefile

 PORTNAME=	strscan
-PORTVERSION=	3.0.5
+PORTVERSION=	3.0.6
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 

devel/rubygem-strscan/distinfo

-TIMESTAMP = 1674590480
-SHA256 (rubygem/strscan-3.0.5.gem) = 6c536279fa95d01ecf690eb73f244b871a7fc54fbf375f71dd4ec0059156fe7c
-SIZE (rubygem/strscan-3.0.5.gem) = 15872
+TIMESTAMP = 1677771641
+SHA256 (rubygem/strscan-3.0.6.gem) = d68e0ebf351efcfa6403f90e0d4e624e9a2969d132ef9ee9d140eff55aa4e4b4
+SIZE (rubygem/strscan-3.0.6.gem) = 15872